:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --accent-color: #fbbf24;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --transition: all 0.2s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: var(--card-bg);
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    border-radius: 24px;
    box-shadow: var(--shadow);
    text-align: center;
}

header {
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

header p {
    color: var(--text-muted);
    font-size: 1rem;
}

.controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
}

.input-group label {
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
}

.input-group input, .input-group select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition);
}

.input-group input:focus, .input-group select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

button {
    flex: 1;
    padding: 0.875rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
}

.primary-btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

.primary-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background-color: var(--border-color);
    color: var(--text-main);
}

.secondary-btn:hover {
    background-color: #d1d5db;
}

.results-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    min-height: 100px;
}

.die {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 800;
    border-radius: 12px;
    box-shadow: var(--shadow);
    animation: pop-in 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes pop-in {
    0% { transform: scale(0); opacity: 0; }
    100% { transform: scale(1); opacity: 1; }
}

.total-display {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-main);
    padding-top: 1rem;
    border-top: 2px solid var(--border-color);
}

#total-value {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-left: 0.5rem;
}

@media (max-width: 480px) {
    .controls {
        grid-template-columns: 1fr;
    }
    .container {
        padding: 1.5rem;
    }
}